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SWRA Engine Sizes / Wing Area - 6/14/2003 9:09:17 AM   
PylonWorld



Posts: 1346
Joined: 12/29/2001
From: Monroe, NC, USA
Status: offline 		A year or so ago, I looked at the SWRA engine size to wing area charts and the 2 cycle engine sizes were half of what the 4 cycle engine sizes were. Now I look at the chart and the 2 and 4 cycle sizes are the same.

Are different engine size / wing area charts being used by different groups? If so, can you point me to them?

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Don Stegall
RCPRO Chairman of the Board
       Post #: 1

SWRA Engine Sizes / Wing Area - 6/17/2003 12:36:52 AM   
PJ_TankPilot



Posts: 396
Joined: 1/16/2002
From: Phoenix, AZ, USA
Status: offline 		I have not read the rules lately but was told by someone who should know that the engine sizes were recently changed to what you describe. This now is the rule. If you are going to have a race sanctioned by the SWRA, you must follow the rules or get a variance approved by the SWRA for your event. If your event is not sanctioned by the SWRA, then it is not an SWRA race.

The original difference was adopted when 4 strokes were less powerful than they are today. IMO, 4 strokes should have a displacement advantage but not double.

At the end of the day, because all SWRA classes have a breakout time, it is probably no big deal. That is, as long as the engine size limit will permit reaching breakout time in Gold.

_____________________________

Warbird racing exercises your adrenal glands.
PJ Herman

(in reply to PylonWorld)
       Post #: 2

SWRA Engine Sizes / Wing Area - 6/17/2003 1:08:46 AM   
Mluvara



Posts: 1429
Joined: 1/14/2002
From: San Jose, CA, USA
Status: offline 		[QUOTE]Originally posted by PJ_TankPilot
I have not read the rules lately but was told by someone who should know that the engine sizes were recently changed to what you describe. This now is the rule. If you are going to have a race sanctioned by the SWRA, you must follow the rules or get a variance approved by the SWRA for your event. If your event is not sanctioned by the SWRA, then it is not an SWRA race.

The original difference was adopted when 4 strokes were less powerful than they are today. IMO, 4 strokes should have a displacement advantage but not double.

At the end of the day, because all SWRA classes have a breakout time, it is probably no big deal. That is, as long as the engine size limit will permit reaching breakout time in Gold. [/QUOTE]

All be darned.... Just went over to [url]www.swraracing.com[/url] and looked at the engine displacement table in their rules. 2 and 4 stroke are the same!

http://www.swraracing.com/swra/year2001/handbook/D-RacingRules.html

Any of the Sacramento clubs following suit? Mike Glavin?

Michael

_____________________________

Michael Luvara
RCATS - http://www.rcatsystems.com
Luvara Air Racing - http://www.LuvaraAirRacing.com

(in reply to PylonWorld)
       Post #: 3

SWRA Engine Sizes / Wing Area - 6/17/2003 2:27:48 AM   
PylonWorld



Posts: 1346
Joined: 12/29/2001
From: Monroe, NC, USA
Status: offline 		[QUOTE]Originally posted by PJ_TankPilot
...

At the end of the day, because all SWRA classes have a breakout time, it is probably no big deal. That is, as long as the engine size limit will permit reaching breakout time in Gold. [/QUOTE]

Speaking of breakout times, that is something I was wondering about.

I've been reading as many sets of rules as I can get my eyes on, and I see that going faster than the breakout time gives you a '0' for the heat. What I don't see anywhere is a description of the flying activity allowed to prevent breaking out.

Since there is a flying start, and you get a '0' for a false start, it would seem to be that you would be better off to have a plane plenty fast to breakout, and sandbag the start. Then fly a longer and paced course to be sure that you don't break out.

Do most of these races end in a drag race to the finish?

I see 2:38, 2:08, and 1:38 on the SWRA site, but the SAM numbers are 8 seconds faster. And I read something in one of the other threads about the AMA requiring a 1:30 breakout in Gold. I can't find anything on the AMA site regarding the SWRA other than the link to the site.

Paul, I previously asked about the wing airfoil and penalties in scale judging. On the scale scoring sheet, there is a -2 for the wing airfoil. So I guess a symmetrical NACA 66 on the model where the full scale aircraft had a flat bottom airfoil could penalize you. I don't really like that, because the airfoils used on full scale aircraft don't work well on models.

Is dropping the scale judging an approved SWRA variance?

I agree that the 4 strokes should have an advantage in displacement as they apparently used to. Planes designed for the low end of the scale have scary specs. A muffled tuned pipe equipped 2 cycle .80 on a 400 sq in bird, for instance.

< Message edited by PylonWorld -- Jun 17 2003 6:43PM >

_____________________________

Don Stegall
RCPRO Chairman of the Board

(in reply to PylonWorld)
       Post #: 4

SWRA Engine Sizes / Wing Area - 6/18/2003 12:26:18 AM   
PJ_TankPilot



Posts: 396
Joined: 1/16/2002
From: Phoenix, AZ, USA
Status: offline 		>>I've been reading as many sets of rules as I can get my eyes on, and I see that going faster than the breakout time gives you a '0' for the heat. What I don't see anywhere is a description of the flying activity allowed to prevent breaking out.

>>Do most of these races end in a drag race to the finish?

You do get a zero if you are faster than breakout, unless you get one cut. Then you get 1 point. The acceptable flying activity to lengthen your time is going long past the pylons. You cannot do any sort of loops, rolls, herky-jerky, etc. at any time. A lot of SWRA heats are decided on the last lap. Some pilots that are ahead of breakout will go long on number one to fake out the others. Other pilots go long on number two. There are a lot of finishes with engine idling, and others going downhill full bore. The last lap is usually the most interesting.

I prefer a plane that I can breakout easily in case it gets real windy. Some pilots prefer a plane that cannot breakout so they don’t have that to think about.

>>Is dropping the scale judging an approved SWRA variance?

I cannot speak for the SWRA board but I doubt you would ever get this approved. Without scale judging, it isn’t even close to being SWRA because you removed the ‘S’ from SWRA.

_____________________________

Warbird racing exercises your adrenal glands.
PJ Herman

(in reply to PylonWorld)
       Post #: 5

SWRA Engine Sizes / Wing Area - 6/18/2003 2:35:10 AM   
PylonWorld



Posts: 1346
Joined: 12/29/2001
From: Monroe, NC, USA
Status: offline 		Thanks Paul.

I'm trying to get things figured out. I haven't had any luck getting racing started here, and I'm looking for options. (I may have some luck when I can start running Slow Quickie or 424 at my field ... we'll see)

Plus, I want to understand the SWRA scene and the warbird racing scene in general. It seems to be a pretty different mindset than AMA event racing.

_____________________________

Don Stegall
RCPRO Chairman of the Board

(in reply to PylonWorld)
       Post #: 6

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